What factors are to be considered while choosing PLC?

Now, let’s look at six of the most important considerations in choosing a PLC: system requirements, environmental requirements, inputs and outputs (I/Os), CPU speed, communication protocol types, and programming.

Why the PLC is common in industrial?

PLCs are widely used in a variety of industries because they’re fast, easy to operate and are considered easy to program. PLCs can be programmed in several ways, from ladder logic, which is based on electromechanical relays, to specially adapted programming languages of BASIC and C, to name a few.

How PLCs are different to the general purpose computers?

A PLC is a digital computer used to control electromechanical processes, usually in an industrial environment. It performs both discrete and continuous control functions and differs from a typical computer in several important ways: PLCs operate on a timescale of milliseconds or even microseconds.

What are the factors that determine the cycle or scanning time for a PLC?

Definition of PLC Scan Time

• Number of inputs.
• Length of logic/Loops in program.
• Number of Outputs.

What is the advantage of having to control circuits by the using PLC microcontrollers?

Task-Dedicated Microcontrollers are only dedicated to one certain task, designed to run one specific program. As opposed to RAM, this program remains in Read-Only Memory (ROM), where it does not change.

What can a PLC control?

So, what can a PLC actually do?

• It can perform relay-switching tasks.
• It can conduct counting, calculation and comparison of analog process values.
• It offers flexibility to modify the control logic, whenever required, in the shortest time.
• It responds to the changes in process parameters within fractions of seconds.

What are the advantages of using PLC over computer?

What are the Advantages of using PLC?

• PLC increases the reliability, flexibility, and accuracy of the automation system.
• PLC (especially Compact PLC) has a lower cost associated with it as compared to the other automation technology.
• PLC software has good capabilities and flexibility for programming.